63-66 engine mounts vs 67-up engine mounts

the part number you need is 2303 and 2304 left and right sides. Made by Westar or Anchor.

Hard to find but there are some on EBAY

the 170 slant six (2.8 liter) uses a different mount than the 225 slant six (3.7 liter)
here are the listing for 2303 left 2304 is same application except right side

Part # Year Make Model Eng Location specification
A2303 1966 Plymouth Barracuda---- 2.8 Front Left
A2303 1966 Plymouth Valiant---- 2.8 Front Left
A2303 1966 Dodge Dart---- 3.7 Front Left
A2303 1966 Dodge Dart---- 2.8 Front Left
A2303 1965 Plymouth Valiant---- 2.8 Front Left
A2303 1965 Plymouth Barracuda---- 2.8 Front Left
A2303 1965 Dodge Dart---- 2.8 Front Left
A2303 1965 Dodge Dart---- 3.7 Front Left
A2303 1964 Plymouth Valiant---- 2.8 Front Left
A2303 1964 Plymouth Barracuda---- 2.8 Front Left
A2303 1964 Dodge Polara---- 3.7 Front Left
A2303 1964 Dodge Polara---- 2.8 Front Left
A2303 1964 Dodge Dart---- 3.7 Front Left
A2303 1964 Dodge Dart---- 2.8 Front Left
A2303 1963 Plymouth Valiant---- 2.8 Front Left
A2303 1963 Dodge Dart---- 2.8 Front Left
A2303 1963 Dodge Polara---- 3.7 Front Left
A2303 1963 Dodge Polara---- 2.8 Front Left
A2303 1963 Dodge Dart---- 3.7 Front Left
A2303 1962 Plymouth Valiant---- 2.8 Front Left
A2303 1962 Dodge Lancer---- 3.7 Front Left
A2303 1962 Dodge Lancer---- 2.8 Front Left
A2303 1962 Dodge Dart---- 3.7 Front Left
A2303 1962 Dodge Dart---- 2.8 Front Left
A2303 1961 Plymouth Valiant---- 2.8 Front Left
A2303 1961 Dodge Lancer---- 3.7 Front Left
A2303 1961 Dodge Lancer---- 2.8 Front Left
A2303 1961 Dodge Dart---- 3.7 Front Left
A2303 1961 Dodge Dart---- 2.8 Front Left
A2303 1960 Plymouth Valiant---- 2.8 Front Left
A2303 1960 Dodge Dart---- 2.8 Front Left
A2303 1960 Dodge Dart---- 3.7 Front Left